import java.util.Scanner;

public class hw2 {
    public static void main(String[] args) {
    String[] num={"one","two","three","four","five","six","seven","eight","nine","ten"};
    int sum=0;
        Scanner input =new Scanner(System.in);
        System.out.println("请输入一个单词：");
        String nums=input.next();
        for (String i:num) {
            if (nums.equals(i)){
                sum=1;
                System.out.println("yes");
            }
        }
        if (sum==0){
            System.out.println("no");
        }
    }
}
